Good Mac Software

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https://itunes.apple.com/us/app/numbers/id409203825?mt=12 It's like excel but free and from apple

https://www.apple.com/mac/keynote/ arguably better than powerpoint in almost every way

https://itunes.apple.com/us/app/alfred/id405843582?mt=12 Alfred (Makes launching apps easy)

https://itunes.apple.com/us/app/transmit/id403388562?mt=12 Makes copying files to internet sites easy

https://itunes.apple.com/us/app/mail-notifr/id808154494?mt=12 Makes "mail to" web browser sites work with gmail

https://itunes.apple.com/us/app/tweetbot-for-twitter/id557168941?mt=12 Good twitter client

http://www.getcloak.com Good way to not get passwords and stuff stolen in coffee houses and such

https://itunes.apple.com/WebObjects/MZStore.woa/wa/viewSoftware?id=671736912&mt=12 Teaches you to "condition" your battery, making it keep high charges for more years

https://www.wunderlist.com great todo list app

https://itunes.apple.com/us/app/daisydisk/id411643860?mt=12 disk space management app

http://www.eye-friendly.com monitor resolution setting app

http://kapeli.com/dash programming language documentation browser

https://itunes.apple.com/us/app/xcode/id497799835?mt=12 iOS and Mac app development

http://realmacsoftware.com/typed good writing app

https://itunes.apple.com/us/app/id435003921?mt=12 good calendaring app 

https://agilebits.com/onepassword good password manager, they have an iOS app too that syncs 

Most IDE's are cross platform. If you liked one on windows, it's probably on mac too.